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- PDB-7lhl: cryo-EM structure of Mycobacterium smegmatis Lhr helicase C-termi... -

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Basic information

Entry
Database: PDB / ID: 7lhl
Titlecryo-EM structure of Mycobacterium smegmatis Lhr helicase C-terminal domain
ComponentsATP-dependent DNA helicase
KeywordsHYDROLASE / helicase / winged helix
Function / homology
Function and homology information


hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides / RNA helicase activity / nucleic acid binding / RNA helicase / ATP binding
Similarity search - Function
DEAD/H associated / DEAD/H associated / DNA glycosylase AlkZ-like / DNA glycosylase AlkZ-like / DEAD/DEAH box helicase / DEAD/DEAH box helicase domain / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. ...DEAD/H associated / DEAD/H associated / DNA glycosylase AlkZ-like / DNA glycosylase AlkZ-like / DEAD/DEAH box helicase / DEAD/DEAH box helicase domain / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ATP-dependent DNA helicase
Similarity search - Component
Biological speciesMycolicibacterium smegmatis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsWang, J. / Warren, G.M. / Shuman, S. / Patel, D.J.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)P30CA008748 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI64693 United States
CitationJournal: Nucleic Acids Res / Year: 2021
Title: Oligomeric quaternary structure of Escherichia coli and Mycobacterium smegmatis Lhr helicases is nucleated by a novel C-terminal domain composed of five winged-helix modules.
Authors: Garrett M Warren / Juncheng Wang / Dinshaw J Patel / Stewart Shuman /
Abstract: Mycobacterium smegmatis Lhr (MsmLhr; 1507-aa) is the founder of a novel clade of bacterial helicases. MsmLhr consists of an N-terminal helicase domain (aa 1-856) with a distinctive tertiary structure ...Mycobacterium smegmatis Lhr (MsmLhr; 1507-aa) is the founder of a novel clade of bacterial helicases. MsmLhr consists of an N-terminal helicase domain (aa 1-856) with a distinctive tertiary structure (Lhr-Core) and a C-terminal domain (Lhr-CTD) of unknown structure. Here, we report that Escherichia coli Lhr (EcoLhr; 1538-aa) is an ATPase, translocase and ATP-dependent helicase. Like MsmLhr, EcoLhr translocates 3' to 5' on ssDNA and unwinds secondary structures en route, with RNA:DNA hybrid being preferred versus DNA:DNA duplex. The ATPase and translocase activities of EcoLhr inhere to its 877-aa Core domain. Full-length EcoLhr and MsmLhr have homo-oligomeric quaternary structures in solution, whereas their respective Core domains are monomers. The MsmLhr CTD per se is a homo-oligomer in solution. We employed cryo-EM to solve the structure of the CTD of full-length MsmLhr. The CTD protomer is composed of a series of five winged-helix (WH) modules and a β-barrel module. The CTD adopts a unique homo-tetrameric quaternary structure. A Lhr-CTD subdomain, comprising three tandem WH modules and the β-barrel, is structurally homologous to AlkZ, a bacterial DNA glycosylase that recognizes and excises inter-strand DNA crosslinks. This homology is noteworthy given that Lhr is induced in mycobacteria exposed to the inter-strand crosslinker mitomycin C.
History
DepositionJan 25, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 7, 2021Provider: repository / Type: Initial release
Revision 1.1May 5, 2021Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.2Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: ATP-dependent DNA helicase
B: ATP-dependent DNA helicase
C: ATP-dependent DNA helicase
D: ATP-dependent DNA helicase


Theoretical massNumber of molelcules
Total (without water)648,0384
Polymers648,0384
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
ATP-dependent DNA helicase


Mass: 162009.562 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycolicibacterium smegmatis (bacteria) / Gene: lhr, ERS451418_01790 / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: A0A0D6HFY2, RNA helicase

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Tetramer structure of ATP-dependent DNA helicase Lhr C-terminal domain
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 260 kDa/nm / Experimental value: YES
Source (natural)Organism: Mycolicibacterium smegmatis (bacteria)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.5
SpecimenConc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 22500 X / Calibrated magnification: 47262 X
Image recordingElectron dose: 53 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.16_3549: / Classification: refinement
EM softwareName: RELION / Category: initial Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 101323 / Num. of class averages: 1 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00817435
ELECTRON MICROSCOPYf_angle_d0.73123787
ELECTRON MICROSCOPYf_dihedral_angle_d12.4310225
ELECTRON MICROSCOPYf_chiral_restr0.0452711
ELECTRON MICROSCOPYf_plane_restr0.0053143

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